I have never seen a 6.5 bolt gun, but would be interested in knowing if one is made. Is there a special reason you want to go with a bolt vs the AR platform? I believe some custom shop could make a 6.5 bolt gun for you but the money factor might not be pretty.
I have no real reason as to why i would want a bolt gun over an AR platform, just think it would be unique. Although the cost im sure is going to be much higher for a bolt gun, but who knows! im going to my local gunsmith tomorrow to get prices on both an upper for an AR platform as well as possibly pricing out a bolt gun!